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granulator failure analysis
2012-08-25 by seoer9

The pellet making machine failure analysis (a)
If necessary, replace the thyristor. 2 Check the thyristor rectifier circuit.
The daily operation of the process of the granulating machine, granulating machine is a common plastic mechanical equipment. Granulation chance to a variety

of failures, affecting the normal production of plastic machinery, I granulating machine fault analysis.
The granulator failure analysis: host current instability
1, for production reasons: 1. Feeding uneven. 2 main motor bearing damage or poor lubrication. Without heating. A certain period of heater failure. Or phase

wrong, screw adjustment pad wrong. Components interfere.
Disposal methods: troubleshooting. Check feeder. If necessary, replace the bearing. 2. Overhaul of the main motor. If necessary, replace the heater. 3 Check

each heater is working properly. Pull out the screw check screw with or without interference. 4 examine and adjust the pad.
The granulator failure analysis: main motor can not start causes: 1. Drove the order wrong. Whether the fuse burned ring. 2 main motor thread. 3. Chain

device works with the main motor
2, the disposal method: press again order the correct car to drive. 1. Checking sequence. Check the main motor circuit. Check the status of the main motor

interlock. The oil pump does not open, check the oil pump is started. The motor can not be opened. Close power wait 5 minutes after the re-start. 4 inverter

induction is not discharged. 5 Check whether the emergency button to reset.
The granulator failure analysis: head out to feed the poor or clogged
Causes: poor materials, plastics. A heater certain does not work. Or plastic wide molecular weight distribution, the operating temperature is set low.

Unstable. 3 there may be not easy molten foreign matter. Disposal methods: replacement if necessary. 1. Checks heaters. When necessary consultation with the

craft. 2 verify each segment set temperature. Raising the temperature set value. Cleanup check extrusion systems and nose.
The granulator failure analysis: main electric start current is too high. Causes: torque. The heating time is lacking. 2 period heater does not work.
Disposal methods: not an easy car should hand drive cars. Prolonged heating or to check paragraphs heater is working properly.
Granulating machine fault analysis: main motor unusual sounds: Causes: 1 main motor bearing damage. Main motor thyristor rectifier circuit of a thyristor

damage.
Disposal methods: Replace the main motor bearings.
Granulating machine fault analysis (b)
Check cleanup extrusion system. Host current instability, granulating machine failure, following the day-to-day operation of the granulator, I continue to

analyze and solve the failure of the granulator.
The bearing lubrication adverse. Serious bearing wear. Check and add lubricant. Check motor bearings and replace if necessary. Uneven speed of the main

motor. Uneven feeding motor speed, fluctuations in the volume of feed. Check the main motor control system and bearings. Check the motor and control system

of feeding system. Lube oil system regulator pressure setting is too low. Oil pump failure or suction pipe clogged. Check and adjust the lubricating oil

system and a pressure regulating valve. Check the oil pump suction pipe. Pressure or low oil pressure. Cylinder (or hydraulic station) leak (or oil) to check

for the power system of the network device. Check pneumatic or hydraulic cylinder seal. The extrusion system torque is too large. The main motor input the

bearing coupling different heart. Check extrusion systems for metal and other objects into the stuck screw. Beginning to occur, check the preheated heating

time or temperature value character 2 to adjust the main motor
Failure or hopper feeding system did not feed into the hard stuck screw extrusion system, so that the material can not check the material level of the feed

system or hopper granulator
The common screw extruder damage reason
On-screw extruder damaged several common reasons
Screw extruder is a common plastic machinery and equipment, extrusion machine screw and barrel combination of the quality of work of these two parts,

plastics materials, products, quality and production efficiency, have a major impact. The quality of their work, with two manufacturing precision parts and

assembly space related. When twenty badly worn, the extruder decline, they should arrange for repair screw extruder screw and barrel.
Screw extruder screw and barrel because of damage
Screw extruder screw in the barrel rotation, friction material with both screw and barrel the surface gradually wear: screw diameter narrowing gradually

increased, the inner hole diameter of the barrel. In this way, with the diameter of the screw and barrel gap, with both the gradual wear a little increase.
However, no change in the resistance of the cylinder head and manifold, which increases the amount of residual material being extruded forward the increase

to the direction of flow of the feed material from the diametrical clearance. Result extruder production decline. This phenomenon has also caused material to

increase the residence time of the barrel, resulting in material decomposition. Polyethylene, the decomposition of hydrogen chloride to enhance corrosion of

the screw and barrel.
2, the material in any filler such as calcium carbonate and glass fibers, can speed up the screw extruder screw and barrel wear.
3, since no plasticizing material evenly, or foreign matter mixed metal compound, so that the screw extruder screw rotation torque suddenly increases, and

this torque force exceeds the ultimate strength of the screw, so that the screw is broken.
Depth analysis of plastics processing failure phenomenon
Because surface cooled and solidified first, 25 raised and deflated: plastic parts in the cooling process in the plastics processing. Internal or wall

thickness of the parts after cooled and solidified, so that the volume shrinkage, the shrinkage speed of the inside and outside of inconsistencies, the

surface layer of the plastic parts formed by the internal tensile recessed shallow pits or dimples.
Often encounter a variety of plastics processing failure, plastic machining. What jargon expression of these faults in the plastic machinery industry with

more precise, I analyze the jargon of the plastic processing failure. As the cavity fill dissatisfied
1. Owe Note: plastics processing. Complete plastic parts shape incomplete phenomenon. Overflow into the mold, the mold surface cracks and retained in the

plastic parts on the remaining material.
Flash flash: Plastics Processing molding process. By injection or extrusion flow of material in the number of shares in the desert with shunt confluence
Weld marks: a plastic surface linear traces. Melt at the interface is not completely fused as one with each other can not weld, caused fusion blot, to affect

appearance quality plastic parts and mechanical properties. Cause the plastic parts table rings shaped, spiral or cloudy waveform uneven defects occurred.
Wave with Current marks: due to the melt in the mold cavity in the improper flow.
5 appearance opacity: refers to the occurrence of of void cracks and thus formed broken plastic piece appearance. Full rupture suddenly subjected to a

certain constant load when asked role due to the plastic member at a specific temperature END plastic pieces of external or internal cracks occur due to

prolonged or repeated stress applied lower than the mechanical properties of plastic and cause the phenomenon known as stress cracking; the phenomenon known

as stress rupture; certain thermoplastic of pieces of excessive exposure to crack and rupture occurred at higher temperatures is called thermal stress

cracking.
6 fracturing: compared to the outside of the layer or layers can be seen through the outer covering of the resin layer laminated plastic reinforced item has

obvious cracks.
7 ruffling: a defect of the appearance of the laminated plastic rupture and clearly separated. Plastic parts appearance appearance of defects in one or more

layers creases or wrinkles.
8. Wrinkles: plastic processing. Similar to the cracking Cream micro-cracks are called albino,
9 more obvious fine cracks cracking and bleaching: plastic surface is called cracking. The cracking and albino are no fissures micro-cracks. Occurs when the

plastic parts are exposed to some chemical environment or in stress conditions, environmental stress cracking.
10 silver marks: the appearance of plastic parts along the material flow direction of the needle-like silver white frost the general appearance of fine

lines.
11 stripes: the appearance of plastic parts or internal linear stripes defects exist.
12 Markings: the pigment dispersing or mixing failure and other causes the plastic appearance of dark spots of mica flakes defects.
13 orange peel: orange peel-like surface of the plastic parts rugged appearance defects. Its inherent cell structure distinction a great cell layer.
14 cell stripes: in the foam. Melt thermal decomposition under the high temperature and pressure conditions,
15 black spots: the plastic molding process. Black carbonized point lead to the appearance of the plastic parts. Optical transmission, you can see the red

tablets,
16. White or bright spots: a transparent or translucent plastic film, sheet or plastic parts memory without fully plasticized particles. This grain point

called "fish eyes" If the data is opaque or colored when this grain point known as white spots or bright. Usually its depth and width are substantially the

same.
17. Pitting: the rules of the surface of the plastic parts or irregular crater.
18. Filler spot: plastic parts caused by the presence of fillers such as wood flour or asbestos obvious scar.
19 dark spot: show a dark stain in the fabric substrate laminate structure. Under conditions of high temperature and high pressure molding
20 charred and paste spots: plastic processing. Melt due to thermal decomposition of carbonized the carbonized coke material blending formed in the melt, the

appearance of plastic parts and internal scar defects. If a large amount of gas remaining within the melt,
21 in the the bubbles: Plastics Processing filling process. Or cavity in the air is not completely drained, so that the plastic parts after molding is formed

within the pores of smaller or stringing defects. Since the inside and outside of the cooling at different speeds,
22. Vacuum bubbles or dark bubble: plastic parts in plastic processing is cooled and solidified. Sometimes the outer layer appearance has cooled and

solidified, but the interior is still in hot melt plastic parts, once the center of the cooling contraction occurs within the vacuum holes, these holes are

generally known as vacuum bubbles or bubble dark, also known as shrinkage.
23. Pinhole: plastic sheet or film in the presence of pinholes size through hole defects.
24.: Foam collapse increases the local density of the foam during the manufacturing process due to cell structure damage caused defects.

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